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Physiology Quiz -Sarcomere - Part 1

The sarcomere is the functional unit of muscle cells. Test your basic knowledge of sarcomere structure and function by taking this simple quiz.

(1) The thin filaments of muscle fibers are made of the following protein:

(A) Actin

(B) Myosin

(C) Tubulin

(D) Albumin

(E)α-Actinin

(2) The thick filaments of muscle fibers are made of the following protein:

(A) Actin

(B) Myosin

(C) Tubulin

(D) Albumin

(E)α-Actinin

(3) Within the muscle sarcomere, at the outer edges of the A band where there is overlap between the thin and thick filaments, each thin filament is surrounded by:

(A) 1 Thick filament

(B) 2 Thick filaments

(C) 3 Thick filaments

(D) 4 Thick filaments

(E) 6 Thick filaments

(4) Within the muscle sarcomere, binding of Ca2+ to this molecule will lead to the exposure of cross-bridge binding sites.

(5) This protein found within skeletal muscle fibers is thought to be the largest (i.e., number of amino acid residues) known protein.